Circular dependencies cannot exist in RelativeLayout, android?

Question

I have the following layout: I need to keep the button at the bottom of screen and it should be visible to the user. The rest of the layout should scroll.

    <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" tools:context="com.vfc.sargroup.SalesOrderActivity$PlaceholderFragment" >  <ScrollView     android:id="@+id/scrollView1"     android:layout_width="match_parent"     android:layout_height="wrap_content"     android:layout_above="@+id/bottomLinearLayout" >      <LinearLayout         android:layout_width="match_parent"         android:layout_height="wrap_content"         android:orientation="vertical" >          <TextView             android:layout_width="wrap_content"             android:layout_height="wrap_content"             android:text="Select Distributor Name"             android:textAppearance="?android:attr/textAppearanceMedium" />          <Spinner             android:id="@+id/spinner1"             android:layout_width="match_parent"             android:layout_height="wrap_content" />          <TextView             android:layout_width="wrap_content"             android:layout_height="wrap_content"             android:text="Payment Collection"             android:textAppearance="?android:attr/textAppearanceMedium" />          <EditText             android:layout_width="match_parent"             android:layout_height="wrap_content"             android:ems="10" >         </EditText>          <TextView             android:layout_width="wrap_content"             android:layout_height="wrap_content"             android:text="Product Category"             android:textAppearance="?android:attr/textAppearanceMedium" />          <EditText             android:layout_width="match_parent"             android:layout_height="wrap_content"             android:ems="10" >              <requestFocus />         </EditText>          <TableLayout             android:id="@+id/salesTableLayout"             android:layout_width="fill_parent"             android:layout_height="wrap_content"             android:layout_marginLeft="20dp"             android:layout_marginRight="20dp"             android:stretchColumns="*" >         </TableLayout>          <TextView             android:layout_width="wrap_content"             android:layout_height="wrap_content"             android:text="Total QTY"             android:textAppearance="?android:attr/textAppearanceMedium" />          <EditText             android:layout_width="match_parent"             android:layout_height="wrap_content"             android:ems="10" >              <requestFocus />         </EditText>          <TextView             android:layout_width="wrap_content"             android:layout_height="wrap_content"             android:text="Total Price"             android:textAppearance="?android:attr/textAppearanceMedium" />          <EditText             android:layout_width="match_parent"             android:layout_height="wrap_content"             android:ems="10" >              <requestFocus />         </EditText>          <TextView             android:layout_width="wrap_content"             android:layout_height="wrap_content"             android:text="Remark"             android:textAppearance="?android:attr/textAppearanceMedium" />          <EditText             android:layout_width="match_parent"             android:layout_height="wrap_content"             android:ems="10" >         </EditText>     </LinearLayout> </ScrollView>  <LinearLayout     android:id="@+id/bottomLinearLayout"     android:layout_width="match_parent"     android:layout_height="wrap_content"     android:layout_alignParentBottom="true"     android:layout_below="@+id/scrollView1"     android:layout_centerHorizontal="true"     android:orientation="vertical" >      <Button         android:id="@+id/button1"         android:layout_width="match_parent"         android:layout_height="wrap_content"         android:text="Submit" /> </LinearLayout>   </RelativeLayout> 

I just need to do scroll my view and keep the button appeared on the screen at the bottom.

The problem is with

     android:layout_above="@+id/bottomLinearLayout" 

I get the error

     Circular dependencies cannot exist in RelativeLayout 

What is wrong with my layout?

Answer 1

The problem is caused because there is a circular reference in the layout parameters.

For example, when view B is layout_below view A, view A can't reference view B anymore in it's below, alignRight etc. This can also exist between multiple views: A references B references C. In that scenario C can't reference A because of a circular dependency.

You Used :-

bottomLinearLayout is below scrollView1 And then you said that scrollView1 is above bottomLinearLayout

It dosen't work like that. Use one

Answer 2

You cannot say the bottomLinearLayout is below scrollView1 then say scrollView1 is above bottomLinearLayout. Only do one, not both.

This is circular because it will try to position itself after it figures out where the other one is at... Which is waiting on the first one.